Question

1. jesse is walking on the sand at the beach one summer day. if heat is not flowing between her feet and the sand, which of the following must be true?

a. the sand is wet.
b. the sand is too cold for heat to flow.
c. the sand is the same temperature as her feet.
d. there is no friction between her feet and the sand.

Explanation:

Heat transfer occurs when there is a temperature difference. If no heat is flowing between Jesse's feet and the sand, it means there is no temperature difference. Option C correctly states that the sand is the same temperature as her feet. Option A (wet sand) doesn't directly relate to no heat flow. Option B (too cold for heat flow) is incorrect as heat flow depends on temperature difference, not just coldness. Option D (no friction) is irrelevant to heat transfer.

Answer:

C. The sand is the same temperature as her feet.